• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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250-500cc Piston clearance WR 250

A

Antonio01

Husqvarna
A Class
Hello everybody, I replate my wr 250 cylinder and the shop send me also the new piston. Now I put it inside the cylinder without rings and it looks like having too much clearance. I don't have a bore dial gauge now to check the clearance. But by looking it and by the sound it makes, I think it's too much clearance. What do you think guys? Thank you so much.

In the link there is a video of the cylinder:

 
Pistons are what is called "cam ground" or tapered. Top of piston is smaller diameter than at the bottom of the skirt. If it was the same size, the top half of the piston would swell up and seize as soon as it got heated up. You can slip in a feeler gauge between the cylinder wall and the bottom of the piston skirt to see if you have the correct clearance. I f you don't know what the clearance is supposed to be, call the shop and ask them.
 
The PDF attachment is from a 2006 WR250 Work Shop Manual
 

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Feel the piston moving from the skirt side and you will notice a lot less movement, it is probably OK like that, If you want to know ask the shop if they recall the clearance they did on your cylinder.

I got myself some equipment to be able to measure it myself instead of bringing stuff over to a shop.
I like to go by the Vertex piston recommendations and I usually do around 0.06mm of clearance on mine.

Cheers.
 

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Last edited:
Hurky said:
Feel the piston moving from the skirt side and you will notice a lot less movement, it is probably OK like that, If you want to know ask the shop if they recall the clearance they did on your cylinder.

I got myself some equipment to be able to measure it myself instead of bringing stuff over to a shop.
I like to go by the Vertex piston recommendations and I usually do around 0.60mm of clearance on mine.

Cheers.
Click to expand...

Thank you so much to all guys. I'll try to find someone than can check it with a bore dial gauge before I mount it. The clearance need to be 0.60mm or 0.060mm?
 
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